package com.atguigu.gulimall.cart.interceptor;

import cn.hutool.core.util.IdUtil;
import com.atguigu.common.constant.AuthServerConstant;
import com.atguigu.common.constant.CartConstant;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.cart.vo.UserInfoTo;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * @Author : Jungle
 * @Description :在执行目标方法之前，判断用户的登录状态，并封装传递给controller
 */
public class CartInterceptor implements HandlerInterceptor {
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();
    /**
     * 1、目标方法执行之前拦截
     *  拦截器--》controller->service->dao
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        //获取的是springsession中的会话信息
        HttpSession session = request.getSession();
        MemberRespVo member = (MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (member != null) {
        //    用户登录
        //    设置用户id
           userInfoTo.setUserId(member.getId());
        }
        Cookie[] cookies = request.getCookies();
        if (cookies != null&&cookies.length>0) {
            for (Cookie cookie : cookies) {
                //user-key
                String name = cookie.getName();
                if (name.equals(CartConstant.TEMP_USER_COOKIE_NAME)){
                   // 设置userkey
                   userInfoTo.setUserKey(cookie.getValue());
                   //设置成功cookie就将tempUser标识设置为true
                   userInfoTo.setTempUser(true);
                }
            }
        }

        //如果没有临时用户，一定分配一个临时用户
        if (StringUtils.isEmpty(userInfoTo.getUserKey())){
            userInfoTo.setUserKey(IdUtil.fastSimpleUUID());
        }

        //目标方法执行之前
        threadLocal.set(userInfoTo);
        //全部放行(上免的操作都是在目标方法--controller 执行之前 )
        return true;
    }


    /**
     * 业务执行完之后
        分配临时用户让浏览器保存
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
    //  让浏览器保存cookie，时间为1个月
        UserInfoTo userInfoTo = threadLocal.get();
        //不是临时用户放cookie
        //如果没有临时用户一定保存一个临时用户
        if (!userInfoTo.isTempUser()){
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME,userInfoTo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
    }
}
